<template>
<div>
  <!--面包屑导航区-->
  <el-breadcrumb separator="/">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>商品列表</el-breadcrumb-item>
  </el-breadcrumb>

  <!--卡片视图区域-->
  <el-card>
<!--    警告区域-->
    <el-alert
      title="注意：只允许为第三级分类设置相关参数"
      type="warning"
      show-icon
      :closable="false"
    >
    </el-alert>

<!--    选择商品分类区域-->
    <el-row class="cat_opt">
      <el-col>
        <span>选择商品分类：</span>
<!--        选择商品分类的级联选择框-->
        <el-cascader
          :options="catelist"
          :props="{
            expandTrigger: 'hover',
            value: 'cat_id',
            label: 'cat_name',
            children: 'children',
            checkStrictly: true
            }"
          v-model="selectedCateKeys"
          @change="handleChange"
          clearable
        ></el-cascader>
      </el-col>
    </el-row>

<!--    页签区域-->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
<!--      添加动态参数的面板-->
      <el-tab-pane label="动态参数" name="many">
<!--        添加参数的按钮-->
        <el-button
          type="primary"
          size="mini"
          :disabled="isBtnisabled"
          @click="addDialogVisible=true"
        >添加参数</el-button>
<!--        动态参数表格-->
        <el-table :data="manyTableData" border stripe>
<!--          展开行-->
          <el-table-column type="expand">
            <template slot-scope="scope">
<!--              循环渲染tag标签-->
              <el-tag
                v-for="(item, i) in scope.row.attr_vals"
                :key="i"
                closable
              >
                {{item}}
              </el-tag>
<!--              输入的文本框-->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
              >
              </el-input>
<!--              添加按钮-->
              <el-button
                v-else
                class="button-new-tag"
                size="small"
                @click="showInput(scope.row)"
              >+ New Tag</el-button>
            </template>
          </el-table-column>
<!--          索引列-->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="参数名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button
                type="primary"
                icon="el-icon-edit"
                size="mini"
                @click="showEditDialog(scope.row.attr_id)"
              >
                编辑
              </el-button>
              <el-button
                type="danger"
                icon="el-icon-delete"
                size="mini"
                @click="removeParams(scope.row.attr_id)"
              >
                删除
              </el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
<!--      添加静态属性的面板-->
      <el-tab-pane label="静态属性" name="only">
<!--        添加属性的按钮-->
        <el-button
          type="primary"
          size="mini"
          :disabled="isBtnisabled"
          @click="addDialogVisible=true"
        >添加属性</el-button>
<!--        静态属性表格-->
        <el-table :data="onlyTableData" border stripe>
<!--          展开行-->
          <el-table-column type="expand"></el-table-column>
<!--          索引列-->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="属性名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button
                type="primary"
                icon="el-icon-edit"
                size="mini"
                @click="showEditDialog(scope.row.attr_id)"
              >
                编辑
              </el-button>
              <el-button
                type="danger"
                icon="el-icon-delete"
                size="mini"
                @click="removeParams(scope.row.attr_id)"
              >
                删除
              </el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
    </el-tabs>
  </el-card>
<!--  添加参数的对话框-->
  <el-dialog
    :title="'添加' + titleText"
    :visible.sync="addDialogVisible"
    width="50%"
    @close="addDialogClose"
  >
<!--    添加参数的对话框-->
    <el-form
      :model="addForm"
      :rules="addFormRules"
      ref="addFormRef"
      label-width="100px"
    >
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
  </el-dialog>

<!--  修改参数对话框-->
  <el-dialog
    :title="'修改' + titleText"
    :visible.sync="editDialogVisible"
    width="50%"
    @close="editDialogClose"
  >
    <!--    添加参数的对话框-->
    <el-form
      :model="editForm"
      :rules="editFormRules"
      ref="editFormRef"
      label-width="100px"
    >
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="editForm.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
  </el-dialog>
</div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data
    },
    // 获取参数列表数据
    async getParamsData () {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类id，和当前所处面板，获取对应参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputVisible = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    handleChange () {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick () {
      this.getParamsData()
    },
    // 监听泰安家对话框的关闭事件
    addDialogClose () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮 添加承诺书
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog (attrId) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClose () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应的参数项
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点或按下enter键
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
      }
      // 如果没有return则证明输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法的作用，就是当页面上元素被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    }
  },
  computed: {
    // 按钮需要被禁用，则返回true，否则返回false
    isBtnisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
